Wirtz's absence from training is not the only concern for Liverpool's defense and midfield, which have struggled this season. Other players, including Conor Bradley and Jeremie Frimpong, were also missing from the training session.

However, other players, such as Rio Ngumoha, Trey Nyoni, and Kaide Gordon, were present at the training session. Calvin Ramsay, who could potentially replace Frimpong or Ramsay, was also in attendance, although he is not eligible to play in the Champions League opening stage.

Liverpool currently has nine points from four games in the Champions League and could move into the top four with a win against PSV. PSV, on the other hand, has collected five points after winning only once so far.